Control device

Abstract

The invention relates to a control device for a multiple cylinder-piston motor for operation with a gaseous fuel, said control device being connected to the gas conduit, leading from the throat of the venturi-tube in the air suction conduit to the evaporator pressure regulator, as well as to the vacuum conduit, leading from downstream the throttle in said air suction conduit to said evaporator-pressure regulator, said control device comprising a control valve provided with a control mechanism, said control valve being incorporated in said gas conduit and said control mechanism being incorporated in said vacuum conduit, the arrangement, on operation of said throttle from its closed position towards its open position, and reverse, allowing the said control valve to be automatically brought from a position for small gas passage to a position for considerable gas pressure, and reverse.

What is claimed is: 
     
       1. A control device for controlling the amount of gaseous fuel delivered from a source of fuel to an air suction conduit wherein said fuel is mixed with air, said conduit having a venturi tube and a throttle plate therein, comprising: a. a housing, having a passage therethrough, said passage having one end connected to said source of fuel and the other end connected to said air suction conduit;   b. valve means disposed in said housing so as to selectively block said passage;   c. a flexible diaphragm affixed to and located with said housing so as to define a first chamber on one side of said diaphragm and a second chamber on an opposite side of said diaphragm;   d. means connecting said diaphragm to said valve means such that movement of said diaphragm causes said valve to open and close said passage;   e. first means connecting said first chamber to said air suction conduit downstream of said throttle plate such that when said throttle plate is closed or partially opened, a vacuum in said first vacuum chamber causes said valve means to partially close said passage so as to restrict the flow of fluel therethrough; and   f. second means connected to said housing to cause said valve means to open said passage when said throttle plate is fully opened.   
     
     
       2. The control device of claim 1 wherein said second means comprises: a. a second conduit connected to said suction conduit; and   b. means connecting said second conduit to said second vacuum chamber.   
     
     
       3. The control device of claim 2 further comprising means for manually adjusting the area of a connecting opening between said second chamber and said means connecting said second conduit to said second chamber. 
     
     
       4. The control device of claim 3 wherein said means for manually adjusting said area comprises a needle valve. 
     
     
       5. The control device of claim 2 wherein said second conduit is connected to the venturi tube of said suction conduit. 
     
     
       6. The control device of claim 1 wherein said housing comprises: a. a first bowl shaped portion;   b. a second bowl shaped portion having its periphery attached to the periphery of said first bowl shaped portion; and   c. a cylindrical extension attached to said second bowl shaped portion and extending therefrom, said extension having a first passage therethrough to allow passage of said gaseous fuel and a second passage oriented perpendicular to said first passage and along the longitudinal axis of said cylindrical extension wherein said valve means is disposed in said second passage.   
     
     
       7. The control device of claim 6 wherein said flexible diaphragm has its periphery attached to said housing at the joint of said first and second bowl - shaped portions. 
     
     
       8. The control device of claim 6 further comprising spring means interposed between said valve means and said cylindrical extension to bias said valve means in an open position. 
     
     
       9. The control device of claim 6 further comprising manually adjustable stop means through said first bowl shaped portion to adjust the maximum deflection of said flexible diaphragm. 
     
     
       10. The control device of claim 1 wherein said second means to cause said valve means to open said passage is a spring connected between said housing and said valve means to bias said valve means in an open position when the vacuum in said first chamber drops below a predetermined valve. 
     
     
       11. The control device of claim 9 wherein second spring means are provided between said valve means and said manually adjustable stop means.